/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.camel.processor;

import java.util.concurrent.Phaser;
import java.util.concurrent.TimeUnit;

import org.apache.camel.AggregationStrategy;
import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.junit.jupiter.api.Assumptions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.RepeatedTest;
import org.junit.jupiter.api.Timeout;
import org.junit.jupiter.api.parallel.Isolated;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

@Isolated
@Timeout(60)
public class SplitParallelTimeoutTest extends ContextTestSupport {

    private volatile Exchange receivedExchange;
    private volatile int receivedIndex;
    private volatile int receivedTotal;
    private volatile long receivedTimeout;
    private final Phaser phaser = new Phaser(3);

    @BeforeEach
    void sendEarly() {
        Assumptions.assumeTrue(context.isStarted(), "The test cannot be run because the context is not started");
        template.sendBody("direct:start", "A,B,C");
    }

    @RepeatedTest(10)
    public void testSplitParallelTimeout() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        // A will timeout so we only get B and/or C
        mock.message(0).body().not(body().contains("A"));

        phaser.awaitAdvanceInterruptibly(0, 5000, TimeUnit.SECONDS);

        assertMockEndpointsSatisfied();

        assertNotNull(receivedExchange);
        assertEquals(0, receivedIndex);
        assertEquals(3, receivedTotal);
        assertEquals(100, receivedTimeout);
    }

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            @Override
            public void configure() {
                from("direct:start")
                        .split(body().tokenize(","), new MyAggregationStrategy()).parallelProcessing().timeout(100)
                        .choice()
                            .when(body().isEqualTo("A")).to("direct:a")
                            .when(body().isEqualTo("B")).to("direct:b")
                            .when(body().isEqualTo("C")).to("direct:c")
                            .end() // end
                        // choice
                        .end() // end split
                        .to("mock:result");

                from("direct:a").process(e -> phaser.arriveAndAwaitAdvance()).delay(200).setBody(constant("A"));

                from("direct:b").process(e -> phaser.arriveAndAwaitAdvance()).setBody(constant("B"));

                from("direct:c").process(e -> phaser.arriveAndAwaitAdvance()).delay(10).setBody(constant("C"));
            }
        };
    }

    private class MyAggregationStrategy implements AggregationStrategy {

        @Override
        public void timeout(Exchange oldExchange, int index, int total, long timeout) {
            // we can't assert on the expected values here as the contract of
            // this method doesn't
            // allow to throw any Throwable (including AssertionError) so that
            // we assert
            // about the expected values directly inside the test method itself.
            // other than that
            // asserting inside a thread other than the main thread dosen't make
            // much sense as
            // junit would not realize the failed assertion!
            receivedExchange = oldExchange;
            receivedIndex = index;
            receivedTotal = total;
            receivedTimeout = timeout;
        }

        @Override
        public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
            if (oldExchange == null) {
                return newExchange;
            }

            String body = oldExchange.getIn().getBody(String.class);
            oldExchange.getIn().setBody(body + newExchange.getIn().getBody(String.class));
            return oldExchange;
        }
    }

}
